Relay Station Selection Using Sorted SNR Indices
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Solution Overview
Problem
Current methods for selecting relay stations in broadband wireless communication systems, such as the Maximum Total SNR Selection method, increase overhead and complexity due to the need for feedback of channel information and extensive calculations, which complicates the process and does not guarantee the selection of the most suitable relay station.
Innovation Solution
An apparatus and method that includes an estimator for channel information, a sorter for indexing relay stations by SNR, and a transmitter to send sorted indices to the Base Station, simplifying the selection process by reducing feedback data size and focusing on the most promising relay stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Maximum Total SNR Selection method is used to select relay stations, then the selection accuracy is improved, but the overhead and process complexity increase due to extensive feedback and calculations
Solution Approach 1:
The patent extracts only the essential channel information (SNR values) from the complete channel state data and uses these extracted values for relay station selection. By taking out only the necessary SNR measurements and excluding unnecessary feedback data, the system achieves accurate relay selection while reducing overhead and complexity.
Solution Approach 2:
The patent segments the relay station selection process into distinct stages: channel measurement at the mobile station, sorting of relay stations based on SNR values, and selection by the base station. This segmentation allows each component to perform a specific function efficiently, reducing overall system complexity while maintaining selection accuracy.
2Reliability
If channel information feedback is implemented for relay station selection, then the selection reliability is improved, but the data size and overhead increase
Solution Approach 1:
The patent extracts only the SNR values from the complete channel state information and feeds back only these essential values to the base station for relay selection. This extraction approach maintains the reliability of selection while significantly reducing the quantity of feedback data transmitted.
Solution Approach 2:
Instead of the base station requesting and processing detailed channel state information from all relay stations, the patent inverts the approach by having the mobile station measure and sort relay stations locally, then only transmit the sorted indices and SNR values. This inversion reduces the data burden on the base station while maintaining selection reliability.
Data Source
AI summary
Selection of a relay station in a broadband wireless communication system is provided. In the broadband wireless communication system, a Base Station (BS) includes a sorter for generating a first index group in which indices of relay stations are sorted according to channel information between the BS and each relay station; a receiver for receiving a second index group in which the indices of the relay stations are sorted according to channel information between a Mobile Station (MS) and each relay station; and a selector for selecting a relay station to be used to communicate with the MS by using the first index group and the second index group.